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But even small trees can provide cover for a predator. Wolves. These, in northern Canada, are the largest and most powerful in the world and they are setting out to hunt. The pack is 25 strong, a sign that the prey they are seeking is formidable. These bison are even bigger than their southern cousins and the largest land animals in North America. For generations, wolves and bison here have been..

These icefalls are an ominous sign of what is about to happen… a rupture deep within the glacier. A colossal iceberg is born. This single block of ice, many hundreds of meters across, would dwarf the biggest of mankind’s buildings. Every year, tens of thousands of icebergs are spawned by Greenland’s glaciers, and their number is steadily increasing as the climate continues to warm. The beak-up o..

This melt water has a surprising effect. It lubricates the junction between the ice and the rock floor beneath, so the entire ice sheet is now on the move, sliding downhill into the ocean. This, jakobshavn Isbrae, is the fastest-flowing glacier on our planet, moving as much as 40 meters a day. As it advances, it destroys everything in its path, even cutting its way through Greenland’s great moun..

Journeying south across the Arctic Ocean, the first land you reach in Greenland, the largest island in the world. Despite its name, Greenland is mostly white, covered by a giant ice sheet six times the size of the United Kingdom. In the middle of the island, the ice is nearly two miles thick. It's a bleak, quiet world. Sapphire-blue melt lakes are the first sign that a dynamic process is underwa..

Each spring, the Arctic Ocean undergoes an extraordinary transformation. An area of sea ice the size of Europe melts, exposing the rich waters beneath. Short-tailed shearwaters have travelled 10,000 miles from Australia to be here. 18 million visitors darken the skies, the largest gathering of sea birds on the planet. Humpback whales have come all the way from the Equator to feed in these rich p..

It seems that courting polar bears prefer privacy, often leaving the sea ice and heading for the hills to avoid the prying eyes of rival males who might disturb them. Few have witnessed this moment. For the male, his only tender encounter in an otherwise solitary life. But it doesn’t last long… a rival suitor has also caught the female’s scent. Courtship has to be put on hold. He must fight for ..

It's spring in the high arctic and the sun illuminates a giant frozen ocean, the first stop on our journey. The most powerful land predator is on the prowl. A male polar bear is searching for a mate. Willing females are few and far between and the sea ice on which he travels will soon melt and vanish. He's running out of time to find a mate in this vast, frozen desert. Ten miles ahead, a single ..

. The poles are permanently capped with ice. Nowhere is colder, windier or more hostile to life. I'm standing at the North Pole, the very top of the Earth. Up here, it's easy to see why the polar regions are so cold. The sun never rises high enough in the sky to warm my back and those rays that do strike the surface are mostly reflected back from this great whiteness. But the fundamental problem..

Over one third of our planet is frozen and yet, the icy worlds of the arctic and antarctic are as alien to most of us as the surface of another planet. They are places of superlative from ice caps that hold nearly 80% of our planet's fresh water to frozen forests that encircle the earth globe. These are places that feed our imaginations, places that seem to be borrowed from fairy tales. They are..